LTC4100 Smart Battery Charger Controller Fea T Descrip T n Single Chip Smart Battery Charger Controller The LTC 4100 Smart Battery Charger is a single chip n 100% Compliant (Rev. 1.1) SMBus Support Allows charging solution that dramatically simplifies construction for Operation with or without Host of an SBS compliant system. The LTC4100 implements n SMBus Accelerator Improves SMBus Timing a Level 2 charger function whereby the charger can be n Wide Output Voltage Range: 3.5V to 26V programmed by the battery or by the host. A SafetySignal n Hardware Interrupt and SMBAlert Response on the battery being charged is monitored for temperature, Eliminate Interrupt Polling connectivity and battery type information. The SMBus n High Efficiency Synchronous Buck Charger interface remains alive when the AC power adapter is n 0.5V Dropout Voltage Maximum Duty Cycle > 98% removed and responds to all SMBus activity directed to n AC Adapter Current Limit Maximizes Charge Rate it, including SafetySignal status (via the ChargerStatus n 0.8% Voltage Accuracy 4% Current Accuracy command). The charger also provides an interrupt to the n Up to 4A Charging Current Capability host whenever a status change is detected (e.g., battery n 10-Bit DAC for Charge Current Programming removal, AC adapter connection). n 11-Bit DAC for Charger Voltage Programming Charging current and voltage are restricted to chemistry- n User-Selectable Overvoltage and Overcurrent Limits specific limits for improved system safety and reliability. n High Noise Immunity SafetySignal Sensor Limits are programmable by two external resistors. Ad- n Available in a 24-Pin SSOP Package ditionally, the maximum average current from the AC adapter is programmable to avoid overloading the adapter a T when simultaneously supplying load current and charging n Portable Instruments and Computers current. When supplying system load current, charg- n Data Storage Systems and Battery Backup Servers ing current is automatically reduced to prevent adapter L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and overload. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174 and 5723970. Typical a T DCIN 0.1F V PART BAT 13.7k 1.21k 3V < 5.5V LTC4101 TO 5.5V > 5.5V LTC4100 0.1F 0.033 LTC4100 5 17 V DCIN DD 11 4 5k DCDIV INFET SYSTEM LOAD 6 24 CHGEN CHGEN CLP 10 23 ACP ACP CLN 20F SMART BATTERY 0.025 7 1 SMBALERT TGATE 3 9 10H SCL BGATE 8 2 SDA PGND 20F 15 21 THB CSP 16 22 THA BAT 13 18 I V LIM SET 1.13k 14 19 100 V I 0.01F LIM TH 20 12 I GND 10k DC 6.04k 0.0015F 54.9k 0.068F 0.12F 0.1F SafetySignal SMBALERT SMBCLK SMBCLK SMBDAT SMBDAT 4100 TA01 Figure 1. 4A Smart Battery Charger 4100fc 1 For more information www.linear.com/LTC4100 ion pplica ions pplica ion uresLTC4100 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW Voltage from V to GND ................................. 7V/0.3V DD TGATE 1 24 CLP Voltage from CHGEN, DCDIV, SDA, PGND 2 23 CLN SCL and SMBALERT to GND ............................ 7V/0.3V BGATE 3 22 BAT Voltage from DCIN, CLP, CLN to GND ............ 32V/0.3V INFET 4 21 CSP Voltage from CLP to CLN .......................................0.3V DCIN 5 20 I DC PGND wrt. GND .................................................... 0.3V CHGEN 6 19 I TH CSP, BAT to GND ............................................... 28V/5V SMBALERT 7 18 V SET Operating Ambient Temperature Range (Note 4) SDA 8 17 V DD 40C to 85C SCL 9 16 THA Junction Temperature Range ................ 40C to 125C ACP 10 15 THB Storage Temperature Range .................. 65C to 150C DCDIV 11 14 V LIM GND 12 13 I Lead Temperature (Soldering, 10 sec) ...................300C LIM G PACKAGE 24-LEAD PLASTIC SSOP T = 125C, = 90C/W JMAX JA o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4100EG PBF LTC4100EG TRPBF LTC4100EG 24-Lead Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4100EG LTC4100EG TR LTC4100EG 24-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: